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<!DOCTYPE html> <html lang="en-US"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=Edge"> <title>(Task 4) Shadow Rays - </title> <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon"> <link rel="stylesheet" href="/assets/css/just-the-docs-default.css"> <script type="text/javascript" src="/assets/js/vendor/lunr.min.js"></script> <script type="text/javascript" src="/assets/js/just-the-docs.js"></script> <meta name="viewport" content="width=device-width, initial-scale=1"> <!-- Begin Jekyll SEO tag v2.7.1 --> <title>(Task 4) Shadow Rays</title> <meta name="generator" content="Jekyll v4.2.0" /> <meta property="og:title" content="(Task 4) Shadow Rays" /> <meta property="og:locale" content="en_US" /> <meta name="twitter:card" content="summary" /> <meta property="twitter:title" content="(Task 4) Shadow Rays" /> <script type="application/ld+json"> {"headline":"(Task 4) Shadow 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<li class="breadcrumb-nav-list-item"><a href="/pathtracer/">A3: Pathtracer</a></li> <li class="breadcrumb-nav-list-item"><span>(Task 4) Shadow Rays</span></li> </ol> </nav> <div id="main-content" class="main-content" role="main"> <h1 id="task-4-shadow-rays"> <a href="#task-4-shadow-rays" class="anchor-heading" aria-labelledby="task-4-shadow-rays"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> (Task 4) Shadow Rays </h1> <p>In this task you will modify <code class="language-plaintext highlighter-rouge">Pathtracer::trace_ray</code> to implement accurate shadows.</p> <p>Currently <code class="language-plaintext highlighter-rouge">Pathtracer::trace_ray</code> computes the following:</p> <ul> <li>It computes the intersection of ray <code class="language-plaintext highlighter-rouge">r</code> with the scene.</li> <li>It computes the amount of light arriving at the hit point <code class="language-plaintext highlighter-rouge">hit.position</code> (the irradiance at the hit point) by integrating radiance from all scene light sources.</li> <li>It computes the radiance reflected from the hit point in the direction of -<code class="language-plaintext highlighter-rouge">r</code>. (The amount of reflected light is based on the BSDF of the surface at the hit point.)</li> </ul> <p>Shadows occur when another scene object blocks light emitted from scene light sources towards the hit point. Fortunately, determining whether or not a ray of light from a light source to the hit point is occluded by another object is easy given a working ray tracer (which you have at this point!). <strong>You simply want to know whether a ray originating from the hit point (<code class="language-plaintext highlighter-rouge">hit.position</code>), and traveling towards the light source (direction to light) hits any scene geometry before reaching the light.</strong> (Note that you need to consider light’s distance from the hit point is given, more on this in the notes below.)</p> <p>Your job is to implement the logic needed to compute whether hit point is in shadow with respect to the current light source sample. Below are a few notes:</p> <ul> <li> <p>In the starter code, when we call <code class="language-plaintext highlighter-rouge">light.sample(hit.position)</code>, it returns us a <code class="language-plaintext highlighter-rouge">Light_sample sample</code> at the hit point . (You might want to take a look at <code class="language-plaintext highlighter-rouge">rays/light.h</code> for the definition of <code class="language-plaintext highlighter-rouge">struct Light_sample</code> and <code class="language-plaintext highlighter-rouge">class light</code>.) A <code class="language-plaintext highlighter-rouge">Light_sample</code> contains fields <code class="language-plaintext highlighter-rouge">radiance</code>, <code class="language-plaintext highlighter-rouge">pdf</code>, <code class="language-plaintext highlighter-rouge">direction</code>, and <code class="language-plaintext highlighter-rouge">distance</code>. In particular, <code class="language-plaintext highlighter-rouge">sample.direction</code> is the direction from the hit point to the light source, and <code class="language-plaintext highlighter-rouge">sample.distance</code> is the distance from the hit point to the light source.</p> </li> <li> <p>A common ray tracing pitfall is for the “shadow ray” shot into the scene to accidentally hit the same objecr as <code class="language-plaintext highlighter-rouge">r</code> (the surface is erroneously determined to be occluded because the shadow ray is determined to hit the surface!). We recommend that you make sure the origin of the shadow ray is offset from the surface to avoid these erroneous “self-intersections”. For example, consider setting the origin of the shadow ray to be <code class="language-plaintext highlighter-rouge">hit.position + epsilon * sample.direction</code> instead of simply <code class="language-plaintext highlighter-rouge">hit.position</code>. <code class="language-plaintext highlighter-rouge">EPS_F</code> is defined in for this purpose(see <code class="language-plaintext highlighter-rouge">lib/mathlib.h</code>).</p> </li> <li>Another common pitfall is forgetting that it doesn’t matter if the shadow ray hits any scene geometry after reaching the light. Note that the light’s distance from the hit point is given by <code class="language-plaintext highlighter-rouge">sample.distance</code>. Also note that <code class="language-plaintext highlighter-rouge">Ray</code> has a member called <code class="language-plaintext highlighter-rouge">time_bound</code>…</li> <li>You will find it useful to debug your shadow code using the <code class="language-plaintext highlighter-rouge">DirectionalLight</code> since it produces hard shadows that are easy to reason about.</li> <li>You would want to comment out the line <code class="language-plaintext highlighter-rouge">Spectrum radiance_out = Spectrum(0.5f);</code> and initialize the <code class="language-plaintext highlighter-rouge">radiance_out</code> to a more reasonable value. Hint: is there supposed to have any amount of light before we even start considering each light sample?</li> </ul> <p>At this point you should be able to render very striking images.</p> <h2 id="sample-results"> <a href="#sample-results" class="anchor-heading" aria-labelledby="sample-results"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Sample results: </h2> <p>At this point, you can add all kinds of lights among the options you have when you create “New Light” in Layout mode, except for Sphere Light and Environment Map which you will implement in task 7 (Note that you can still fill in <code class="language-plaintext highlighter-rouge">Sphere::Uniform::sample</code> in <code class="language-plaintext highlighter-rouge">Samplers.cpp</code> now to view the result of a mesh under Sphere Light).</p> <p>The head of Peter Schröder rendered with hemishphere lighting.</p> <center><img src="new_results/shadow_peter.png" style="height:240px" /></center> <p>A sphere and a cube with hemishphere lighting</p> <center><img src="new_results/cube_sphere_hemisphere.png" style="height:240px" /></center> <p>Hex and cube under directional lighting</p> <center><img src="new_results/ref1.png" style="height:240px" /></center> <p>Bunny on a plane under point light</p> <center><img src="new_results/ref2.png" style="height:400px" /></center> <p>Spot on a sphere under diretional lighting</p> <center><img src="new_results/ref3.png" style="height:240px" /></center> <p>Spot on a sphere under hemisphere lighting</p> <center><img src="new_results/ref4.png" style="height:240px" /></center> </div> </div> <div class="search-overlay"></div> </div> </body> </html>
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href="/animation/skinning" class="nav-list-link">Skinning</a></li><li class="nav-list-item "><a href="/animation/particles" class="nav-list-link">Particles</a></li></ul></li></ul> </nav> <footer class="site-footer"> This site uses <a href="https://github.com/pmarsceill/just-the-docs">Just the Docs</a>, a documentation theme for Jekyll. </footer> </div> <div class="main" id="top"> <div id="main-header" class="main-header"> <div class="search"> <div class="search-input-wrap"> <input type="text" id="search-input" class="search-input" tabindex="0" placeholder="Search " aria-label="Search " autocomplete="off"> <label for="search-input" class="search-label"><svg viewBox="0 0 24 24" class="search-icon"><use xlink:href="#svg-search"></use></svg></label> </div> <div id="search-results" class="search-results"></div> </div> </div> <div id="main-content-wrap" class="main-content-wrap"> <nav aria-label="Breadcrumb" class="breadcrumb-nav"> <ol class="breadcrumb-nav-list"> <li class="breadcrumb-nav-list-item"><a href="/pathtracer/">A3: Pathtracer</a></li> <li class="breadcrumb-nav-list-item"><span>Visualization of normals</span></li> </ol> </nav> <div id="main-content" class="main-content" role="main"> <h1 id="visualization-of-normals"> <a href="#visualization-of-normals" class="anchor-heading" aria-labelledby="visualization-of-normals"><svg viewBox="0 0 16 16" aria-hidden="true"><use xlink:href="#svg-link"></use></svg></a> Visualization of normals </h1> <p>For debugging purposes:</p> <p>You can set the <code class="language-plaintext highlighter-rouge">bool normal_colors</code> to true in <code class="language-plaintext highlighter-rouge">student/debug.h</code> to check if the normals that you have computed at the hit point are correct or not for debugging purposes.</p> <p>Here are some reference results:</p> <p><img src="new_results/cbox_normal.png" style="height:200px" /> <img src="new_results/norm1.png" style="height:200px" /> <img src="new_results/norm2.png" style="height:194px" /> <img src="new_results/norm3.png" style="height:194px" /></p> </div> </div> <div class="search-overlay"></div> </div> </body> </html>
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